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  <title>ol-ext: Openlayers feature animation</title>
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  <a href="https://github.com/Viglino/ol-ext" class="icss-github-corner"><i></i></a>

  <a href="../../index.html">
    <h1>ol-ext: Openlayers feature animation</h1>
  </a>
  <p class="info">
    This example show how to use a transparent style to enable feature selection on animation loop.
    <br/>
    It uses an infinite animation loop to animate features on the map. 
    A transparent feature is displayed to enable selection.
  </p>

  <!-- DIV pour la carte -->
  <div id="map" style="width:600px; height:400px;"></div>

  <div class="options">
    <h2>Options:</h2>
    <i>Click on features to stop/start animation...</i>
  </div>
  
  <script type="text/javascript">
  // Layers
  var layer = new ol.layer.Geoportail('ORTHOIMAGERY.ORTHOPHOTOS')

  // The map
  var map = new ol.Map({
    target: 'map',
    view: new ol.View ({
      zoom: 5,
      center: [166326, 5992663]
    }),
    layers: [layer]
  });
  // Change pointer over feature
  map.on("pointermove", function (evt) {
    var hit = this.forEachFeatureAtPixel(evt.pixel, function(feature, layer) { return true; }); 
      if (hit) this.getViewport().style.cursor = 'pointer';
      else this.getViewport().style.cursor = '';
  });

  // Style to draw the feature
  var color = [0,0,255];
  var fillcolor = [0,0,255,0.3];
  var style = [
    new ol.style.Style({
      image: new ol.style.Shadow({ radius: 15, }),
      stroke: new ol.style.Stroke({ color: [0,0,0,0.3], width: 2 }),
      fill: new ol.style.Fill({ color: [0,0,0,0.3]}),
      zIndex: -1
    }),
    new ol.style.Style({
      image: new ol.style.RegularShape({ radius: 10, radius2: 5, points: 5, displacement: [0, 10], fill: new ol.style.Fill({ color: color }) }),
      /** /
      image: new ol.style.Icon({
        src: 'https://cdn.pixabay.com/photo/2014/04/02/10/45/poi-304466_960_720.png',
        scale: .05,
        anchor: [0.5, 1]
      }),
      /**/
      stroke: new ol.style.Stroke({ color: color, width: 2}),
      fill: new ol.style.Fill({ color: fillcolor })
    })
  ];

  // Transparent style to handle click on animation
  var transparent = [0,0,0,0.01];
  var filltransparent = [0,0,0,0];
  var transparentStyle = [
    new ol.style.Style({
      image: new ol.style.RegularShape({ radius: 10, radius2: 5, points: 5, displacement: [0, 10], fill: new ol.style.Fill({ color: transparent }) }),
      stroke: new ol.style.Stroke({ color: transparent, width: 2 }),
      fill: new ol.style.Fill({ color: filltransparent})
    })
  ];

  // Intinite loop animation
  var animTab = [];
  var anim = new ol.featureAnimation.Bounce({
    duration: 800,
    hiddenStyle: transparentStyle
  });
  // Continune animation if not stop by user
  anim.on('animationend', function(e){
    if (!e.user) animTab[e.feature.get('nb')] = vector.animateFeature (e.feature, anim);
  });

  // On select start/stop animation
  var select = new ol.interaction.Select({ hitTolerance: 1 });
  map.addInteraction(select);
  select.on('select', function(e){
    if (e.selected.length){
      var f = e.selected[0];
      select.getFeatures().clear();
      // Create animation if doesn't exist
      if (!animTab[f.get('nb')]) {
        animTab[f.get('nb')] = vector.animateFeature (f, anim);
      }
      // Stop animation if playing 
      else if (animTab[f.get('nb')].isPlaying()) {
        animTab[f.get('nb')].stop({user: true});
      } else {
        animTab[f.get('nb')].start();
      }
    }
  });

  // Vector layer
  var source = new ol.source.Vector();
  var vector = new ol.layer.Vector({
    source: source,
    style: style
  });
  map.addLayer(vector);

  // Add a feature on the map
  function addFeatureAt(nb, featureType, p) {
    var f, r = map.getView().getResolution() *10;
    switch (featureType) {
      case 0:
        f = new ol.Feature(new ol.geom.LineString([
          [p[0]-8*r,p[1]-3*r], 
          [p[0]-2*r,p[1]+1*r], 
          [p[0]+2*r,p[1]-1*r], 
          [p[0]+8*r,p[1]+3*r]
        ]));
        break;
      case 1:
        f = new ol.Feature(new ol.geom.Polygon([[
          [p[0]-4*r,p[1]-2*r], 
          [p[0]+3*r,p[1]-2*r], 
          [p[0]+1*r,p[1]-0.5*r], 
          [p[0]+4*r,p[1]+2*r], 
          [p[0]-2*r,p[1]+2*r], 
          [p[0]-4*r,p[1]-2*r]
        ]]));
        break;
      default:
        f = new ol.Feature(new ol.geom.Point(p));
        break;
    }
    f.set("nb", nb);
    vector.getSource().addFeature(f);
  }

  // Add 10 random features
  function add10() {
    // Clear and end animation loop
    vector.getSource().clear();
    select.getFeatures().clear();
    var ex = map.getView().calculateExtent(map.getSize());
    // Add features after animation ends
    for (var i=0; i<10; i++) {
      addFeatureAt( i, Math.round(Math.random()*3), [
        ex[0] +Math.random()*(ex[2]-ex[0]),
        ex[1] +Math.random()*(ex[3]-ex[1])
      ]);
    };
  }
  add10();

  </script>
  
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